Investigating the Effect of Drought Stress on Grain Yield and Biochemical Parameters of Different Wheat Cultivars

In an attempt to investigate the effect of drought stress on the biochemical parameters and the yield of different bread wheat cultivars, a split plot experiment was carried out with three replications following a randomized complete block design in the research farm of the rain-fed research deputy of Sararood. The main plots included drought stress treatments at four levels: I1 (drought stress at the beginning of stem elongation stage: 31 Zadoks), I2 (drought stress at the beginning of boot stage: 43 Zadoks), I3 (drought stress at the beginning of grain filling stage: 70 Zadoks), and I4 (full irrigation). The Subplots included cultivars treatments at three levels: Chamran (C1), Marvdasht (C2), and Shahriar (C3). A significant difference (p